Centrifugal paperstock screen



Oct. 18, 1932. A. J. HAUG CENTRIFUGAL PARERS TOCK SCREEN Filed June 10, 1929 2 Sheets-Sheet 1 Oct. 18, 1932. A. J. HAUG 1,882,662

CENTRIFUGAL PAPERSTOCK SCREEN Filed June 10, 1929 2 Sheets-Sheet 2 Patented Oct. 18, 1932 ANTON J". HA'UG, OF NASHUA, NEW HAMPSHIRE CENTRIIUGAL PAPERSTOCK SCREEN Application filed June 10, 1929. Serial No. 369,618.

This invention relates' to apparatus for and process of removing undesirable substances from paperstock and similar material, and is particularly intended for use to accomplish the final screening operation ahead of the papermachine, where it is necessary that all particles of foreign matter be withdrawn from the stock and that all fiber clusters, which may have formed during previous op- 16 erations in the preparation of the paperstock,

be disintegrated or removed.

Y The machines now used for the final screening operation, known as papermachine screens, are not particularly efiicient or capa 16 ble of handling very large volumes of stock; and while they do succeed in freeing the stoc means to remove fine particles of sand, cinders, etc., which are of greater specific gravity than the stock fibers themselves, as well as minute lighter impurities which float.

Special dirt separators are now coming into use in the industry, such separators being designed to assist the operation of the papermachine screens. These separators are lowcapacity apparatus, however, and since a moderate production of paperstock would require a large number of separating machines,

the use of such separators in conjunction with 39 the present papermachine screens would tend to increase costs and congestion ineven moderate-size mills.

The principal object of the present invention is therefore the production of a-maohine which will deliver economically a relatively large volume of. well-screened and cleansed stock, combining the two functions of the papermachine screen and the dirt separator in a single, simply-constructed apparatus.

In carrying out the objects of the invention, I have utilized some of the broad principles covered in my Patents #1,533,410 dated April 14,1925, #1,551,953, dated Sept. ,1, 1925 and #1,755,162, datedApril 15, 1930 and in my co-pending' applications Serial #331,178 filed Jan. 9, 1929 and 366,241 filed May27, 1929.

. Referrmg now to the accompanying drawings I Figure 1 shows a vertical sectional elevaof most of the fiber mats, they lack ary inlet 13 which enters the container cention of a preferred form of machine embodying the principal elements of the invention, Fig. 2 is a longitudinal elevation partly in section illustrating the manner in which the chief features of the invention may be applied to a machine of horizontal construction, the internal equipment of this latter machine being identical with that of machines disclosed in my prior patents hereinabove referred to,

Fig. 3 is an end view, partly in section, taken on lines z'z-a of Fig. 2, and showing particularly the outlet for heavy impurities,

and

Fig. 4 is a detail view in section of" the 66 device for removing heavy impurities.

In the drawings, 1 (Fig. 1) denotes a preferably, though not necessarily, conical casing which, with cover 2, forms a stationary container wherein the chief operating part of the invention, comprising a cylindrical basket composed of an imperforate' dishshaped bottom 3 provided with a centrallydisposed tubular extension forming hollow shaft 4, ahead 5 and foraminou's walls 6, is positioned to revolve. The container is supported on legs 7.

Shaft 4 is carried in two sets of ball bearings 8 and 8a, one race 9 of each of said bear ings being held in casings 10 attached to lugs 11 cast on legs- 7', and the other race 9a of each bearing fast to turn with the shaft.

- 12 denotes an electric motor connected to shaft 4 by a worm 12a attached to the motor shaft and a worm gear 126 fastened to shaft 4, providing means to drive said shaft at any desired speed.

Paperstock in suitably dilute condition is introduced into the machine through stationtrally thereof and discharges the incoming 1 stock through mouth 14 against a spreader 15 which distributes the stock along the inner circumference of the basket, the relatively fine portion of the solids, including good stock fibers, fine dirt, etc. being driven by centrifugal force produced by the rapid revolution of the basket through the perforations in the circumference of the basket, while the larger material comprisinglarger impurities and Water may be admitted to circular chamber 16 in the interior ofthe basket through pipe 17 to thin and wash the tailings, which are moved toward tailings outlet 18 by the revolution of the basket in connection with g the inclined bars 19, which are held suitably close to the perforated circumference of' the basket by means of arms 20 attached to spreader and arms a fastened to the 15 walls of water-chamber 16.

a When the tailings reach the lower end of the basket, they are scraped out therefrom by adjustable scoop 21, adjustment for which is provided by the combination of bar 22; worm 23, worm gear 24 and handwheel 25 all of which is similar to the device for a like urpose shown in my copending application gerial 327,390 issued as Patent 1,755,162 dated April 15, 1930. After being scraped from 25 the basket, the tailin are discharged from the machme throug pipe 26 extending through hollow shaft 4.

The relativel fine stock which has passed through the per orations of the basket is given a rapid whirling motion, due to contact with the rapidly revolving basket, the relatively heavy impurities insaid stock being thrown to the circumference of the container and finally collecting in that section thereof which has the largest diameter, which, in the case of the present machine, is the bottom of the container, whence it maybe automatically withdrawn through outlet 27 (see particularly Figs. 1 and 4) attached to or cast oncylindrical casing 28 in .which a valve body 29 keyedto shaft 30 is adaptedto revolve,

motion being imparted to said shaft by worm 31, worm gear 32 and electric motor 33. The valve is provided with "a pocket 34 which, as

the valve rotates, periodically registers with outlet 35 of the container and withdraws a quantity of heavy impurities which have collected near said outlet, said impurities being then carried by said pocket until it reaches mouth 27 where the impurities are dischar ed out of the machine. The outer circum erence of the valve is furnished with .numerous recesses to catch dirt which might otherwise become wedged in between the valve and casing 28, and cramp the valve in its rotation.

The cleansed stock, thus freed of both coarse material and fine, relatively heavy impurities, rises to the top of the container,

whereit flows through approximately circular outlet 36, which is formed by the inner edges of shutter-fingers 37, the latter being un1tedly-movable inward or outward to contract or enlarge said outlet by adjustment of handwheel 38, similar to the arrangement shown in my co pending application Serial 366,241. The stock, after passing through outlet 36, enters trough 39 wherein it is forced under an adjustable lip 40, the up r edge of which is so positioned as to be a apted to skim the light, floating impurities from the surface of the stock, said impurities being discharged through i e 41 and the clean stock flowing out of t e machine through mouth 42.

It is desired tdbe understood that although I have described one specific embodiment 'of my invention, other constructions may be employed to carry out the novel features of said invention. Fori'nstance, a horizontal machine may be constructed as shown in Fig. 2; or the circumference of the revoluble basket may befurnished with slots instead of perforations as disclosed herein, or it may be composed of wire cloth; or the said basket may be stationary, instead of revoluble, and

the stock may be impelled through the openings thereof by a rotor inside said basket, and the casing may be revolved either independently of, or in connection with, rotation of the basket, all of which is subordinate to the main novel principle of combining the functions-of a screen and a dirt separator in a single machine of the centrifugal type.

Having thus described my invention, what I desire to claim as new is:

' 1. In a separating machine for paperstock and similar material, the combination with a, container, of means to introduce li uid stock separately from the container, and sepgrate, automatic means to withdraw the relativelly heavy impurities from said container.

arscreemng machine for paperstock and similar material, the combination with a container, of means to introduce liquid stock thereinto, a rotating screen drum in 1 said container, means to revolve said drum rapidly to separateboth the relatively coarse material and the relatively heavy impurities from said stock, and means to withdraw the relatively light, screened fine stock separately from. the container.

4. In a screening'machine for paperstock and slmllar material, the combinatlon with a conical container, of means to introduce liquid stock thereinto, means 'to separate the relatively coarse material from said stock, a special agency to move said separated coarse material toward the outlet therefor, means to separate the relatively heavy impurities.

from the stock, and means to withdraw the relatively light, screened fine stock separate ly from the container.

5. In a separating machine for paperstock and similar material, the combination with a container,of means to introduce liquid stock thereinto, means to cause relative motion between said stock and said container to remove the relatively coarse material from said stock and to separate the relatively heavy impurities from the fine, or screened, stock, and means to withdraw the relatively light, screened fine stock separately from the container.

6. In a separating machine for paperstock and similar material, the combination w th a container, of a rotor therein, means to sup ply liquid stock to the interior of said rotor,

' means to revolve said rotor rapidly to force the relatively fine stock out of said rotor and to separate impurities from the stock surrounding said rotor, and means to withdraw the separated coarse stock, the impurities, and

screened stock separately from the container.

10. In a screening machine for paperstock and similar material, the combination with a container, of a separating chamber therein, means to introduce liquid stock into said chamber, means to remove relatively coarse material from the stock, means to separate the relatively fine, heavy impurities from the ANTON J. HAUG.

the relatively light, screened fine stock sepax rately from the container.

7. In a separating machine for paperstock and similar material, the combination with a container, of means to introduce liquid stock thereinto, a separating agency adapted to operate in said stock to separate the relatively coarse material and the impurities therefrom, and means adjustable during the operation of the 'machine to control the amount of stock subjected to the impuritiesseparating action at any one time, at the discharge of the relatively fine stock.

8. In a screening machine for paperstock I and similar material, the combination with a container, of means to introduce liquid stock thereinto, means to subject all the stock entering said container 'to two grading operations, by one of which operations said solids are graded according to weight and by the other of which operations said solids are graded according to size, and means to withdraw the acceptable stock separately from the container.

9. In a screening machine for paperstock and similar material, the combination with a container, of a separating chamber therein, means to introduce liquid stock into said chamber, means to remove relatively coarse material from the stock, means to separate stock, means to retard the escape of the stock undergoing treatment from the separating the relatively fine, heavy impurities from the v stock, means to retard the escape of the stock undergoing treatment from the separating chamber to permit a prolonged separating operation, means to withdraw the relatively coarse material, the relatively fine, heavy impurities and the relatively light, fine 

